Silent sounder



-March 31.1925. v 4 1,531,543

.1. J. COOPER SILENT SOUNDER Filed Nov. '22, 1920 ratented Mar. v31, 1925.

JAMES J'. COOPER, 0F ATLANTA, GEORGIA.

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Application filed November 22, 1920. Serial No. 425,895.

To all whom it may concern:

Be it known that I, JAMES J. Coornn, a citizen of the United States, residing at Atlanta, in the county of Fulton and State of Georgia, have invented certain new and i useful Improvements in Silent Sounders, of which the following is a specification, reference being had therein to the accompanying drawing. 1

My invention relates to telegraphy, and has for its object the provision of a sounder or receiving instrument by means of which those afiiicted with deafness may become skilled telegraph operators, and. others may receive messages without depending upon the usual audible signals. v

I attain my object by providing .a magnetic receiving device capable of attachment to the head of the operator, as by a head band in a manner well understood by those skilled in telegraphy and telephony. This device comprises an electromagnet, an ar-- mature, and a pressure finger which normally rests upon the operators temple. By preference the 'device is in duplicate, so that simultaneous contact may be had with both temples. By the application of electric current to the magnets, the pressure may be increased for a short or a longer period, the short impulses corresponding to the usual telegraph dot, and the longer impulses to the dash, the results of back stroke being eliminated. Preferably the two magnets are connected in series with a suitable battery and the contact of an ordinary telegraph relay or sounder, which is in turn connected to line. J

My invention is illustrated in the accompanying drawings wherein,

Fig. 1 is a front view of my device complete, except for the flexible cord;

Fig. 2 is a side View of the same;

Fig. 3 is a diagram of the circuit; and' Fig. 4 shows a modification of the electromagnet.

In the drawings, 1 is a head spring or yoke, having mounted on its opposite ends magnet frames 2,-the temple side of each being provided with three inwardly projecting legs 3. Rigidly fastened to the temple side of the frames 2 are flat springs 4 (only one shown) which carry at their free ends diaphragms 5, from the center of which project through the magnet frames 2 pressure fingers 6 which normally exert a gentle pressure against the temples of l the operator. Adjusting screws 7 provide means for regulating the normal pressure of the pressure fingers 6 against the temples. It is, of course understood that the magnet frames 2 are wound with suitable magnet wire 10 and 12 and the passage of an electric current around them will attract the diaphragms, thus increasing the pressure of fingers 6 against the temples. It is also to be understood that when the circuit is broken the pressure is not relieved but simply reduced to its normal intensity. The three inwardly projecting members 3 may be of any desired shape or material which will hold the magnet frames squarely against the temples of the operator without discomfort, such as wood, rubber or steel.

One s stem of circuit wiring may be that,

shown in Fig. 3,where 8 represents a battery,- 9 a wire leading .to magnet winding 10, 11 a wire connecting magnet-windings 10 and 12, 13 a wire leading to the sounder contact 14:, 15 the sounder armature and 16 a return wire to the. battery. These wires are preferably all made up in a flexible cord.

From'the foregoing it will be seen that 1 any impulse of the sounder or relay will be duplicated by my head instrument through the diaphragm action. I

In Fig. 4 I have shown each electromagnet with two poles, connected through a yoke 17, the diaphragm or armature 5 bridging the projecting ends of the poles and the central pressure finger passing through an opening in the yoke. The circuits in this modification are the same as before.

What- I claim is:

1. A telegraph receiving instrument comprising an electromagnet having fixed projections on the same fitted to the tcmple of an operator and a head band for supporting the same in place, an armature for said"- magnet, a spring supporting the same on the magnet structure, a rod connected to said armature, a pressure terminal on said rod for adjusting the spring with respect to egree' without. break?- ing the continuity of contact when the magnet is deenergi'zed.

2. A telegraphreceiving instrument having a pair of i entical electromagnets with fixe projections on the magnet structures fitted to the temples of an operator and a head band for supporting the same in place, armatures for 'said magnets, pressure terminals on said arm'atures, means for adjust identical electromagnets being connected in the same circuit whereby simultaneous and identical pressure will be communicated to both temples of the operator.

3. A telegraph receiving instrument comprising an annular coil adapted to rest against the temple of an operator and a headband for supporting thesame in place, anarmature 'extendin diametrally across one vend of the coil an centrally supported thereon but spaced awaytherefrom so as to leave a suitable air gap, said armature through said coil and to reproduce the same as variations of pressure on the temple of the o erator.

4. telegraph receiving instrument having a pair of identical electromagnets fitted to the temples of an operator and a head-4 band for supporting the same in place, armatures for .said magnets adapted to be acted 'upon thereby according to variations in current passing through said magnets, and thereupon acting to produce variations in mechanical pressure on the temples of the operator", each electromagnet comprising an annular coil diametrally bridged by the armature, and both said coils being included in the same signalling circuit, so as to be simultaneously afiected by the same variations in the current therein, so as to impart said variations simultaneously to both temples of the operator. 7

In testimony whereof I afix my signature.

JAMES J. COOPER. Witnesses:

JosJW. RENSHAW, W. QBELL. 

